| behind one's back |
when one is not present; secretly. |
| bug |
(informal) a tiny microphone hidden for the purpose of listening to and recording voices secretly. [1/6 definitions] |
| conspire |
to plan secretly to do something wrong or illegal with another person or people. |
| in private |
with no one else near; privately or secretly. |
| on the sly |
secretly; in a crafty way. |
| peek |
to look quickly or secretly. [1/2 definitions] |
| peep1 |
to look quickly or secretly through a narrow opening or from a hiding place. [1/3 definitions] |
| prowl |
to move around slowly and secretly, like an animal looking for prey. [2/3 definitions] |
| run away |
If someone runs away with another person, they leave secretly to get married or to be together as a couple. Couples sometimes run away if their parents or other people don't want them to get married, or if the couple wants to get married but they don't want to have the fancy wedding that other people want them to have. [1/3 definitions] |
| sabotage |
to secretly damage enemy property or secretly interfere with its activities. [1/2 definitions] |
| secretly |
When you do something secretly, you hide what you are doing from other people and you don't tell people about it. |
| sneaky |
If a person is sneaky, they hide what they are doing from other people. When people are sneaky, they don't want to get caught doing what they are doing. If some action is sneaky, it is done secretly, and it is often a bad thing. Sneaky things can be good sometimes, but more often they are not. |
| spirit away |
to remove secretly or mysteriously. |
| spy |
A spy is a person who works secretly for a government in order to find out what another country's government is doing and planning. [2/3 definitions] |
| steal |
to move secretly or without being noticed (usually followed by "in," "out," or "away"). [1/6 definitions] |
| tail |
(informal) to follow secretly in order to observe. [1/7 definitions] |
| tap2 |
to connect wires to, for the purpose of listening secretly. [1/4 definitions] |
| up one's sleeve |
held secretly or in reserve. |